.cus_module_background {
    background-color: aqua;
}
body{
    background-color: #1a1a1a;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 5s;
}

body:hover {
    background-color: red; /* 鼠标悬停时变为橙色 */
}